solve for y. -2x+3y=9
whats the parallel line equation?
whats the perpendicular line?

Dec 16th 2008, 05:38 PM

mr fantastic

Quote:

Originally Posted by b.gilmore

solve for y. -2x+3y=9
whats the parallel line equation?
whats the perpendicular line?

.

Once you have solved for y, gradient = coefficient of x.

Parallel lines have the same gradient.

The product of the gradients of a pair of perpendicular lines is equal to -1.

Without further data, the best you can do is express the equation of each required line in the form y = mx + c where m is the gradient (which you can calculate) and c is the y-intercept (for which there is not enough data to get a value of).